In Humans, Neanderthal physicist Ponter Boddit, a character you will never forget, returns to our world and to his relationship with geneticist Mary Vaughan, as cultural exchanges between the two Earths begin." As we see daily life in another present-day world, radically different from ours, in the course of Sawyer's story, we experience the bursts of wonder and enlightenment that are the finest pleasures of science fiction.